Goryeo was invaded from the Mongols in seven main campaigns through the 1230s until eventually the 1270s, but was hardly ever conquered.[117] Fatigued after decades of combating, Goryeo sent its crown prince for the Yuan money to swear allegiance on the Mongols; Kublai Khan approved, and married one among his https://edwin3nm0b.bloggazza.com/32958933/detailed-notes-on-korea